Elevator-leg drive.



Patented Mar. 23, 1909.

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Patented Mar. 23, 1909.

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SGOTTF. EVANS, OF MINNEAPOLIS, MINNESOTA.

ELEVATOR-LEG DRIVE.

Specification of Letters Patent.

Patented March 23, 1909.

Application filed November 1, 1906. Serial No. 341,538.

T 0 all whom it may concern:

Be it known that I, Sco'rT F. EVANS, of

Minneapolis, Hennepin county, Minnesota, have invented certam new. anduseful Immotor is usually employed as a motive power and a non-reversingfriction stop which forms the subject matter of a pending applicationfor Letters Patent of the United States, serial No. 335,600, filed by meSeptember 21, 1906, prevents backward movement of the mechanism, andchoking of the elevator leg, but I have found that when the motor stopsby the cutting off of the power temporarily or for any reason, and thenon-reversing mechanism holds the load and prevents choking of the leg,that the motor after stopping cannot again start the load until it haseen previously operated up to its normal working speed. The turning ofthe current on the motor with the full load attached obviously havingthe effect only ofburning out the motor.

The object, therefore, of my present invention is to provide meanswhereby a motor used in connection with a non-reversing stop mechanismcan be operated independently of the stop and its connections untilspeeded up to the desired point, and at that time connected or coupledto the drive shaft 'to release. the non-reversing stop mechanism andlift the load.

My invention consists generally in a shaft having a driving connectionwith an elevator leg and a non-reversing friction sto a motor operatingindependently of sai driving shaft and a clutch device whereby said driving shaft and the motor shaft can be coupled together.

Further, the invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims.

In the accompanying drawings, forming part of this specification, Figure1 is a view illustrating the application of my invention to an elevatorleg, Fig. 2 is a side view partially in section showing the constructionof the ap aratus.

In t e drawing, 2 represents a driving shaft having bearin s 3 and apulley 1 for connection with an e evator leg (not shown).

5 is an electric motor mounted on a base 6 I and having its shaft 7concentric preferably with the shaft 2.

8 is a disk secured to the support of the bearings 3 and having aperipheral flange 9 and forming with the arms 10 and their bearingblocks a friction stop device covered by the pending application abovereferred to. I make no clalm therefore in this case to the friction stopdevice except in combination with other elements.

11 is one 'member of a friction clutch secured on the shaft 2.

13 represents arms pivoted on the member 11 and having bearing blocks 14to engage the surfaces 15 on the member 12.

A collar 16 is slidably mounted on the shaft 2 and pivotally connectedwith the arms 13 by links 17. An operating lever 18 is provided for thesaid collar.

19 represents the elevator leg, 20 the drive shaft for the elevatoroperatively connected with the shaft 2 through gears 21 and 22, shaft 23and pinions 24 and 25.

The operation of the device is as follows: The lever 18 is operated tothrow the clutch into its working position and the motor started torevolve the shaft 2 and transmit its motion to the elevator leg. In casethe motor for any reason stops, the non-reversing device willautomatically prevent backward movement of the mechanism. At that timethe operator will throw the clutch out of its working position andrelease the motor shaft from its connection with the driving shaft. Themotor can then be speeded up to the desired point running without anyload, the stop mechanism holding it automatically and when the speed ofthe motor is sufliciently high, the clutch will be thrown to its workingposition again and the driving shaft coupled to the motor shaft. In thisway a large amount'of time and labor which are frequently wasted ingetting the motor and its connections in running order again after thechoking of the elevator leg, can be saved.

I do not in this application claim to have invented a motor, a frictionclutch or a nonreversing means but I do claim a new and bination ofthese elements.

I claim as my invention The combination with an elevator leg of adriving shaft having an operative connection with said leg, 2.non-reversing stop mechanimproved result obtained by the novel comismprovided in connection with said shaft and arranged to permit the freerevolution of said shaft in one direction but positively looking itagainst movement in the opposite direction, a motor having a shaft and aclutch mechanism arranged to couple said motor shaft and said drivingshaft together, and means for operating said clutch mechanism, saidnon-reversing mechanism preventing backward movement of said drivingshaft and said motor shaft and said clutch

